Liu XJ, Wang BM, Yan XY, Liu WT, Lu ZS, Zhang J. Expression of COX-2 in Barrett's esophagus and esophageal adenocarcinoma and its significance.
Shijie Huaren Xiaohua Zazhi 2005;
13:2314-2317. [DOI:
10.11569/wcjd.v13.i19.2314]
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Abstract
AIM: To explore the significance of cyclooxygenase-2 (COX-2) expression and prostaglandin E2 (PGE2) level in human Barrett's esophagus (BE) and esophageal adenocarcinoma (EAC).
METHODS: The expression of COX-2 mRNA, the distribution of COX-2 protein, and the content of PGE2 were detected in the endoscopic biopsies of from BE (n = 16), EAC (n = 17), and normal controls (n = 20) by reverse transcription polymerase chain reaction (RT-PCR), immunohistochemistry, and radioimmunoassay (RIA), respectively.
RESULTS: The positive rate of COX-2 mRNA was 87.50% (14/16) and 88.24% (15/17) in BE and EAC patients, respectively, which were significantly higher than that in the normal controls (25%, P < 0.01). Furthermore, COX-2 protein was expressed in the epithelial cytoplasm of BE patients (81.25%, 13/16) and the plasm of cancer cells in EAC patients (76.47%, 13/17), which were significantly higher than that in the normal controls (20.00%, 4/20). The contents of PGE2 (pg/mg) in BE (541.41 ± 34.30) and EAC patients (559.22 ± 37.77) were also significantly higher than those in the normal controls (357.10 ± 37.58) (P < 0.05). No significant difference was found between BE and EAC patients in COX-2 mRNA, protein expression and PGE2 content (P>0.05).
CONCLUSION: COX-2 mRNA and its protein are overexpressed, and the level of PGE2 is increased in BE and EAC group. COX-2 and PGE2 may be involved in the development of Barrett's esophagus and esophageal adenocarcinoma.
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